Hi Eric and Soren,
thanks a lot for your suggestions. I tried switching to
linux-tick-processor, which gives more relevant results.
I am relatively happy with the low tick count (27), but it still puzzles me
why these are categorized as "Unknown". My output now looks like:
Statistical profiling result from ../v8cgi/v8.log, (27 ticks, 27
unaccounted, 0 excluded).
[Unknown]:
ticks total nonlib name
27 100.0%
[Shared libraries]:
ticks total nonlib name
[JavaScript]:
ticks total nonlib name
2 7.4% 7.4% LazyCompile: <anonymous>
/home/ondras/svn/v8cgi/lib/js.js:0
1 3.7% 3.7% Script: native messages.js
1 3.7% 3.7% Script: native date.js
1 3.7% 3.7% Script: /home/ondras/svn/v8cgi/example/wwwclient.js
1 3.7% 3.7% LazyCompile: shift native array.js:314
1 3.7% 3.7% LazyCompile: join native array.js:214
1 3.7% 3.7% LazyCompile: SetupArray native array.js:707
1 3.7% 3.7% LazyCompile: RegExpConstructor native regexp.js:52
1 3.7% 3.7% LazyCompile: <anonymous> native v8natives.js:183
1 3.7% 3.7% Function: <anonymous>
Also, I do not fully understand the percentage numbers: which are supposed
to sum up to 100%? The "bottom up" profile part contains basically the same
data as the simple output contained in this e-mail.
Thanks,
Ondrej
2009/5/26 Søren Gjesse <[email protected]>
> To add to Eriks comment I also suggest that you try the newer JavaScript
> based tick processor instead of the Python based one. Use
> linux-tick-processor instead
> of linux-tick-processor.py. linux-tick-processor is a shell script which
> runs the developer shell (d8) with the JavaScript code to process the log
> file.
> /Søren
>
>
> On Tue, May 26, 2009 at 13:47, Erik Corry <[email protected]> wrote:
>
>>
>> 2009/5/26 ondras <[email protected]>:
>> >
>> > Hi,
>> >
>> > I am a newbie to V8 profiler - I was not able to get it correctly
>> > running. Here is what I do and what I see:
>> >
>> > ond...@kapitan:~/svn/v8$ scons library=shared sample=shell && ./shell
>> > --prof -e "1+1" && tools/linux-tick-processor.py v8.log
>> > scons: Reading SConscript files ...
>> > scons: done reading SConscript files.
>> > scons: Building targets ...
>> > scons: `sample' is up to date.
>> > scons: done building targets.
>> > Statistical profiling result from v8.log, (12 ticks, 12 unaccounted, 0
>> > excluded).
>> >
>> > [Unknown]:
>> > ticks total nonlib name
>> > 12 100.0%
>> >
>> > [Shared libraries]:
>> > ticks total nonlib name
>> >
>> > [JavaScript]:
>> > ticks total nonlib name
>> >
>> > [C++]:
>> > ticks total nonlib name
>> >
>> > [GC]:
>> > ticks total nonlib name
>> > 0 0.0%
>> >
>> > [Call profile]:
>> > total call path
>> > 12 100.0% <no call path information>
>> >
>> >
>> > However, the v8.log file looks okay - it has 554 lines of data.
>> >
>> > What am I doing wrong?
>>
>> Could it be that the program is running for too short a time? Perhaps
>> if you try a longer-running js script you will get some ticks that are
>> hitting something interesting.
>>
>> Check that the paths to the executables and libraries that are listed
>> in the beginning of the v8.log file match something that the
>> tick-processor script can read and interpret with the nm command.
>>
>> --
>> Erik Corry, Software Engineer
>> Google Denmark ApS. CVR nr. 28 86 69 84
>> c/o Philip & Partners, 7 Vognmagergade, P.O. Box 2227, DK-1018
>> Copenhagen K, Denmark.
>>
>>
>>
>
> >
>
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